Learning Objectives
At the end of this lesson, students will be able to:
 Read and understand given problem situations.
 Make tables and identify patterns.
 Solve realworld problems using selected strategies as part of a plan.
Vocabulary
Terms introduced in this lesson:

compound interest

population decrease

intensity (loudness) of sound
Teaching Strategies and Tips
Remind students of the fourstep problemsolving plan.
In Example 1, students must find the compound interest formula on their own by looking for a pattern. Guide them through the first two years until the pattern becomes evident.
Have students check their answers to the examples presented in this lesson by finding , the growth or decay rate, instead of looking for a pattern. Have them compute . The method was presented in Examples 6 and 7 in lesson Exponential Growth Functions.
Encourage students to construct tables and look for patterns in Review Questions 14. Suggest that they only check their work using explicit formulas.
Error Troubleshooting
In Review Questions 14, remind students to convert the percents to decimals.